<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
    <!-- 角色列表区域 -->
    <el-table :data="roleList" stripe border>
      <!-- 展开列 -->
      <el-table-column type="expand">
        <template slot-scope="scope">
          <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']" v-for=" (item1, i1) in scope.row.children" :key="item1.id">
            <!-- 渲染一级权限 -->
            <!-- 每行分24份，第一列用5份，第二列用19份 -->
            <el-col :span="5">
              <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
              <i class="el-icon-caret-right"></i>
            </el-col>
            <!-- 渲染二级和三级权限 -->
            <el-col :span="19">
              <!-- 通过for循环 嵌套渲染二级权限 -->
              <el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                <!-- 二级权限 -->
                <el-col :span="6">
                  <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">
                    {{item2.authName}}
                  </el-tag>
                  <i class="el-icon-caret-right"></i>
                </el-col>
                <!-- 三级权限 -->
                <el-col :span="18">
                  <el-tag v-for="item3 in item2.children" :key="item3.id" type="warning" closable @close="removeRightById(scope.row,item3.id)">
                    {{item3.authName}}
                  </el-tag>
                </el-col>
              </el-row>
            </el-col>
          </el-row>
        </template>
      </el-table-column>
      <el-table-column type="index" label="#">
      </el-table-column>
      <el-table-column label="角色名称" prop="roleName">
      </el-table-column>
      <el-table-column label="角色描述" prop="roleDesc">
      </el-table-column>
      <el-table-column label="操作" width="300px">
        <template slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
          <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightDialog(scope.row)">分配权限</el-button>
        </template>
      </el-table-column>

    </el-table>
    </el-card>
    <!-- 分配权限  -->
    <el-dialog
    title="分配权限"
    :visible.sync="setRightDialogVisible"
    width="50%"
    @close="setRightDialogClosed">
    <!-- 树形控件 -->
    <el-tree :data="rightList" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
    <span slot="footer" class="dialog-footer">
      <el-button @click="setRightDialogVisible = false">取 消</el-button>
      <el-button type="primary" @click="allotRights">确 定</el-button>
    </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data () {
    return {
      // 所有角色列表数据
      roleList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限的数据
      rightList: [],
      // 树形控件的树形绑定
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点id值
      defKeys: [],
      // 当前即将分配权限的id
      roleId: ''
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) return this.$message.error('获取角色列表失败！')
      this.roleList = res.data
    },
    // 根据ID删除对应的权限
    async removeRightById (role, rightId) {
      console.log(rightId)
      // 弹框提示用户删除
      const confirm = await this.$confirm(
        '此操作将删除该权限, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      if (confirm !== 'confirm') {
        return this.$message.warning('取消了删除')
      }
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      )
      console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败！')
      }
      role.children = res.data
      this.$message.success('删除权限成功！')
    },
    // 展示分配权限的对话框
    async showSetRightDialog (role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) return this.$message.error('获取权限数据失败')
      // 把获取到的权限数据 保存到data中
      this.rightList = res.data
      // 递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式获取角色下的所有三级权限的id，并保存到defKeys数组中
    getLeafKeys (node, arr) {
      if (!node.children) {
        // 如果当前节点不包含children属性，则是三级节点
        return arr.push(node.id)
      }
      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },
    // 监听分配权限对话框的关闭
    setRightDialogClosed () {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      console.log(keys)
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) return this.$message.error('分配权限失败！')
      this.$message.success('分配权限成功！')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>
<style lang="less" scoped>
.el-tag{
  margin: 7px
}

.bdtop{
  border-top: 1px solid #eee
}

.bdbottom{
  border-bottom: 1px solid #eee
}

.vcenter{
  display: flex;
  align-items: center;
}
</style>
